Pocket knife



FIG. 1 is a perspective view of a pocket knife showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an end view thereof taken from the left of FIG. 2; and

FIG. 6 is an end view thereof taken from the right of FIG. 2. 

The ornamental design for a pocket knife, as shown and described. 